TERMS DEFINITIONS Autonomic movement. The movements induced by some internal causes are called autonomic movement. It example is ciliary movement. Paratonic movement The movement induced by external stimuli is called Paratonic mmement. Tropic movement The movements in curvature of whole organ. towards or away

The non-directional movements of the plant in response to external stimuli are called nastic movement. The variation in the intensity of some external- factor acts as stimulus. The direction of the movement is determined by the structure of the plant organ itself. It is

Movements are of universal occurrence in plants. Most of the plants are fixed. They can bend only their parts. It is called curvature movement. The locomotory movement of the animal type also occurs among plants. These are shown by free swimming organisms. For example,